[BUG] Using the output slot breaks trait conformance

[samufi]

Bug description

When using the results slot in a method necessary to implement a trait, the compiler complains that the trait is not implemented.

Steps to reproduce

This fails:

@register_passable("trivial")
struct MyStruct(Hashable):
    var val: Int
    fn __hash__(self) -> UInt as output:
        output = UInt(self.val)

This works:

@register_passable("trivial")
struct MyStruct(Hashable):
    var val: Int
    fn __hash__(self) -> UInt:
        return UInt(self.val)

System information

- WSL on Windows 10
- mojo 24.5.0 (e8aacb95)
- magic 0.2.3